How to Stream Pump.fun Token Launches via WebSocket (Node.js)

Introduction

Polling a REST endpoint for new launches is always too late: by the time your interval fires, a bot with an open WebSocket connection has already acted. In this tutorial you open a Datastream connection and receive every new Pump.fun mint within milliseconds of block confirmation.

What you need

• Node.js 18+
• A Solana Tracker API key (free) and Datastream key (Premium+, same dashboard)
• 5 minutes

Step 1 — Install the SDK

npm install @solana-tracker/[email protected] ws

Step 2 — Connect to the Datastream

import WebSocket from 'ws';
(globalThis as any).WebSocket = WebSocket;
const { Datastream } = await import('@solana-tracker/data-api');

const ds = new Datastream({ wsUrl: `wss://datastream.solanatracker.io/${process.env.ST_DATASTREAM_KEY}` });

ds.on('connected', () => console.log('Connected to Datastream'));
ds.connect();

Step 3 — Subscribe to new Pump.fun launches

ds.subscribe.latest().on((token) => {
  const market = token.pools[0]?.market;
  if (market !== 'pumpfun') return;
  console.log('New launch:', token.token.name, token.token.mint);
});

Step 4 — Filter out the noise

Most fresh mints are worthless. Filter directly on the fields included in the payload:

ds.subscribe.latest().on((token) => {
  const pool = token.pools[0];
  if (pool?.market !== 'pumpfun') return;
  if ((token.risk?.score ?? 0) < 6) return;
  if ((pool.liquidity?.usd ?? 0) < 3000) return;
  console.log('Promising launch:', token.token.name, token.token.mint, token.risk.score);
});

The Datastream sends a 1-10 risk score with each token (snipers, bundlers, insiders, authorities), so you don't have to build that layer yourself.

Step 5 — Wire it to an action

For example, send a Telegram alert or trigger your trade logic:

async function alert(token) {
  await fetch(`https://api.telegram.org/bot${BOT}/sendMessage`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      chat_id: CHAT_ID,
      text: `New launch: ${token.token.name}\nMint: ${token.token.mint}\nRisk: ${token.risk.score}/10`,
    }),
  });
}

FAQ

How fast do launches arrive?

Within sub-second latency on paid tiers, measured from block confirmation.

Do I need gRPC?

No. For most launch scanners the WebSocket Datastream is fast enough and much quicker to build. For raw program-level detection you can add Yellowstone gRPC.

Can I listen to multiple markets at once?

Yes — omit the market filter to receive all DEXes, or subscribe to separate rooms.

Next: Detect Pump.fun graduations → · Full reference on the Pump.fun API page.

Download the example

Clone the full runnable project on GitHub — npm install && npm start with your keys in .env. Or open it in StackBlitz to run in your browser (free). See the tutorial for step-by-step context.